// detectSeriesAndHardwareCharacteristics detects the OS
// series and hardware characteristics of the remote machine
// by connecting to the machine and executing a bash script.
func detectSeriesAndHardwareCharacteristics(host string) (hc instance.HardwareCharacteristics, series string, err error) {
logger.Infof("Detecting series and characteristics on %s", host)
cmd := ssh.Command("ubuntu@"+host, []string{"/bin/bash"}, nil)
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
cmd.Stdin = bytes.NewBufferString(detectionScript)
if err := cmd.Run(); err != nil {
if stderr.Len() != 0 {
err = fmt.Errorf("%v (%v)", err, strings.TrimSpace(stderr.String()))
}
return hc, "", err
}
lines := strings.Split(stdout.String(), "\n")
series = strings.TrimSpace(lines[0])
arch := arch.NormaliseArch(lines[1])
hc.Arch = &arch
// HardwareCharacteristics wants memory in megabytes,
// meminfo reports it in kilobytes.
memkB := strings.Fields(lines[2])[1] // "MemTotal: NNN kB"
hc.Mem = new(uint64)
*hc.Mem, err = strconv.ParseUint(memkB, 10, 0)
*hc.Mem /= 1024
// For each "physical id", count the number of cores.
// This way we only count physical cores, not additional
// logical cores due to hyperthreading.
recorded := make(map[string]bool)
var physicalId string
hc.CpuCores = new(uint64)
for _, line := range lines[3:] {
if strings.HasPrefix(line, "physical id") {
physicalId = strings.TrimSpace(strings.SplitN(line, ":", 2)[1])
} else if strings.HasPrefix(line, "cpu cores") {
var cores uint64
value := strings.TrimSpace(strings.SplitN(line, ":", 2)[1])
if cores, err = strconv.ParseUint(value, 10, 0); err != nil {
return hc, "", err
}
if !recorded[physicalId] {
*hc.CpuCores += cores
recorded[physicalId] = true
}
}
}
if *hc.CpuCores == 0 {
// In the case of a single-core, non-HT CPU, we'll see no
// "physical id" or "cpu cores" lines.
*hc.CpuCores = 1
}
// TODO(axw) calculate CpuPower. What algorithm do we use?
logger.Infof("series: %s, characteristics: %s", series, hc)
return hc, series, nil
}
func (s *archSuite) TestNormaliseArch(c *gc.C) {
for _, test := range []struct {
raw string
arch string
}{
{"windows", "windows"},
{"amd64", "amd64"},
{"x86_64", "amd64"},
{"386", "i386"},
{"i386", "i386"},
{"i486", "i386"},
{"arm", "armhf"},
{"armv", "armhf"},
{"armv7", "armhf"},
{"aarch64", "arm64"},
{"arm64", "arm64"},
{"ppc64el", "ppc64"},
{"ppc64le", "ppc64"},
} {
arch := arch.NormaliseArch(test.raw)
c.Check(arch, gc.Equals, test.arch)
}
}